For Shop Owners

P1504 - Intake Air Control Circuit Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Faulty Idle Air Control Valve
  • Idle Air Control Valve harness is open or shorted
  • Idle Air Control Valve circuit poor electrical connection
  • Faulty Powertrain Control Module (PCM)
What does this mean?

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1504 Description

The Idle Air Control Valve (IACV) valve assembly controls the engine idle speed and provides a dashpot function. The IAC valve assembly meters intake air around the throttle plate through a bypass within the IAC valve assembly and throttle body. The Powertrain Control Module (PCM) determines the desired idle speed or bypass air and signals the IAC valve assembly through a specified duty cycle. The IAC valve responds by positioning the IAC valve to control the amount of bypassed air. The PCM monitors engine RPM and increases or decreases the IAC duty cycle in order to achieve the desired RPM.
OBDII Code P1504 - Intake Air Control Circuit Malfunction -

P1504 Information for specific makes

P1504 AUDI Intake Air System Bypass Leak Detected
P1504 BMW Idle Speed Control Valve Closing Solenoid Control Open Circuit
P1504 BUICK Vehicle Speed Output Circuit
P1504 CADILLAC Vehicle Speed Output Circuit
P1504 CHEVROLET Vehicle Speed Output Circuit
P1504 FORD Intake Air Control Circuit Malfunction
P1504 GMC Vehicle Speed Output Circuit
P1504 HYUNDAI Cruise Control Cancel Switch Fault
P1504 KIA Cruise Control Cancel Switch Fault
P1504 LINCOLN Intake Air Control Circuit Malfunction
P1504 MAZDA IAC Electrical Load Failure
P1504 MERCURY Intake Air Control Circuit Malfunction
P1504 MINI Idle Speed Control Valve Closing Solenoid Control Open Circuit
P1504 SUBARU Vehicle Speed Sensor CAN Malfunction
P1504 VOLKSWAGEN Intake Air System Bypass Leak Detected

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P1504 Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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